Time Calculator
Add, subtract, multiply, and divide time values in days, hours, minutes, and seconds, calculate time difference between two timestamps, and convert time units.
Time Calculator
Add, subtract, multiply, and divide time units (days, hours, minutes, seconds) with instant conversion across all scales.
Time Arithmetic, Duration Operations & Unit Conversions
Calculate time between two times, add or subtract durations, and convert hours, minutes & seconds. Free online time calculator with elapsed time and timestamp tools.
Converts multi-part time representations into total base seconds for exact mathematical operations, then decomposes the result back into normalized days, hours, minutes, and seconds.
- 1Select your operation mode (Add/Subtract, Multiply/Divide, Timestamp Difference, or Unit Converter).
- 2Enter hours, minutes, and seconds for each quantity.
- 3The calculator computes the normalized result with full decimal representations in hours, minutes, and seconds.
- 4Instantly copy the result or share the calculation.
Combining two video recording segments into a single runtime.
Frequently Asked Questions (FAQ)
Use the Timestamp Difference tab — enter a start time (e.g. 9:00 AM) and an end time (e.g. 5:30 PM) and the calculator instantly shows the elapsed time: 8 hours 30 minutes. It handles overnight spans automatically, so a start of 10:00 PM and end of 6:00 AM correctly returns 8 hours.
Switch to the Timestamp Difference mode, enter your two clock times in hours and minutes, and the result shows the gap as hours, minutes, and seconds. For example, the time between 2:15 PM and 7:45 PM is 5 hours 30 minutes.
Yes, you can multiply any time quantity by integer or decimal numbers (e.g. 45m 30s × 3.5 = 2h 39m 15s).
Switch to the Add & Subtract tab, enter both time quantities in days/hours/minutes/seconds, and the calculator returns the normalized total (e.g. 4h 45m + 2h 35m = 7h 20m).
Use the Timestamp Difference tab, enter a start time and an end time, and the calculator computes the exact elapsed duration between them, handling overnight spans automatically.
Yes, the Multiply/Divide tab supports dividing any time quantity by a number — for example, splitting a 2h 15m video into 3 equal segments of 45 minutes each.
Use the Time Unit Converter tab to instantly convert any quantity between days, hours, minutes, and seconds in either direction.
Yes, when calculating the difference between two clock times where the end time is earlier than the start time, the calculator automatically treats it as spanning into the next day.
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